Unixcop published a tutorial about installing and configuring Icinga2 and Icinga2 Web on CentOS 8.

How to install and configure Icinga2 and Icinga2 Web on CentOS 8

Icinga 2 is a free and open source monitoring tool designed to be scalable and extensible. Icinga 2 checks the availability of your network resources, notifies users of outages, and generates performance data for reporting. We can monitor large and complex environments across multiple locations using Icinga2. 

How to install and configure Icinga2 and Icinga2 Web on CentOS 8 - Unixcop